Effect of laser remelting on microstructure and properties of micro-arc oxidation layer on aluminum alloy

doi:10.13251/j.issn.0254-6051.2023.04.041

Abstract

Abstract: Laser remelting was used to improve corrosion resistance of the micro-arc oxidation layers on 6061 aluminum alloy. The porosity, roughness, surface morphology, phase composition and corrosion resistance of the micro-oxidation layers under laser power of 500-1000 W were studied by means of optical microscope, confocal microscope, scanning electron microscope, X-ray diffractometer and electrochemical workstation. The results show that the micro-arc oxidation layer after laser remelting is mainly composed of α-Al₂O₃ and γ-Al₂O₃ phases, and the conversion degree from γ-Al₂O₃to α-Al₂O₃ increases with laser power increasing. When the laser power is in the range of 500-900 W, the porosity of the micro-arc oxidation layer increases firstly and then decreases, but the roughness does not change significantly. When the laser power is up to 1000 W, the micro-arc oxidation layer surface becomes bulging and cracking, which makes the roughness and porosity of the layer increase. When the laser power is 900 W, the micropore size decreases or even closes, and the number of cracks is reduced, the surface porosity is minimized, the corrosion resistance is the best.

Key words: aluminum alloy, micro-arc oxidation, laser remelting, corrosion resistance

CLC Number:

TG174

Lin Dan, Gu Gaoyang, Shang Jian. Effect of laser remelting on microstructure and properties of micro-arc oxidation layer on aluminum alloy[J]. Heat Treatment of Metals, 2023, 48(4): 264-272.

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